Resources Contact Us Home
Biodegradable bursting release system

Image Number 4 for United States Patent #5429822.

A biodegradable polymeric multiphasic release system of one or more biodegradable bursting units capable of delivering biologically active substances in a burst or pulse at predetermined times and a method for constructing those units is disclosed. The individual bursting units of the system may take the form of a biodegradable, membrane coated capsule surrounding a core material which may include an active agent. The membrane ruptures after a predetermined time upon exposure to water or bodily, or other aqueous environmental fluids. The bursting units may be used in any situation in which a controlled pulsed release of an active substance is desired. The predetermined time release of each bursting unit is controlled by the composition of the core material, the initial radius and wall thickness of the membrane and the porosity of the membrane. The core material may also contain a chemical composition which generates gas as fluid is drawn into the bursting unit thus adding an additional design variable for predetermining bursts.

  Recently Added Patents
Process and apparatus for producing composite material that includes carbon nanotubes
Endotracheal tube
Managing and collaborating with digital content
Motor drive component verification system and method
Plants and seeds of hybrid corn variety CH424126
Image processing unit, image processing method and program
Video reproducing apparatus and video reproducing method
  Randomly Featured Patents
Dental measurement instruments
Sheet dividers with enhanced tabs
Biodegradable fibers manufactured from thermoplastic starch and textile products and other articles manufactured from such fibers
Boronized laying pipe
Brake adjuster
Water aerator
Enhanced pointing device for handicapped users
Exhaust gas purification device for an engine
Keyboard accelerator
Topcoated adhesive